Origin rotates but object does not
As already said by @Xtremity in the comments, it is rotating but you don't notice it. Your big gear has 30 teeths, so every 12 degrees (360 / 30) one teeth. Before the short stop, you rotate by +6 degrees every frame, so half a teeth of the big wheel. After the pause however, you rotate by 12 degrees, exactly one teeth, per frame, so you just don't see it rotating.

By the way, you're not rotating in the opposite direction after the stop, it just looks like it.

Rotation in frame 209:



Rotation in frames 210 to 230:



Rotation in frame 231:



You can clearly see, that before frame 210 it rotates by 6 degrees, after frame 230 by 12 degrees.